# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""abstract component class and base components definition for CubicWeb web

client

"""

__docformat__ = "restructuredtext en"

_ = unicode

from warnings import warn

from logilab.common.deprecation import class_deprecated, class_renamed

from logilab.mtconverter import xml_escape

from cubicweb import Unauthorized, role, target, tags

from cubicweb.schema import display_name

from cubicweb.uilib import js, domid

from cubicweb.utils import json_dumps

from cubicweb.view import ReloadableMixIn, Component

from cubicweb.selectors import (no_cnx, paginated_rset, one_line_rset,

                                non_final_entity, partial_relation_possible,

                                partial_has_related_entities)

from cubicweb.appobject import AppObject

from cubicweb.web import INTERNAL_FIELD_VALUE, htmlwidgets, stdmsgs

# abstract base class for navigation components ################################

class NavigationComponent(Component):

    """abstract base class for navigation components"""

    __regid__ = 'navigation'

    __select__ = paginated_rset()

    cw_property_defs = {

        _('visible'):  dict(type='Boolean', default=True,

                            help=_('display the component or not')),

        }

    page_size_property = 'navigation.page-size'

    start_param = '__start'

    stop_param = '__stop'

    page_link_templ = u'<span class="slice"><a href="%s" title="%s">%s</a></span>'

    selected_page_link_templ = u'<span class="selectedSlice"><a href="%s" title="%s">%s</a></span>'

    previous_page_link_templ = next_page_link_templ = page_link_templ

    no_previous_page_link = u'<<'

    no_next_page_link = u'>>'

    def __init__(self, req, rset, **kwargs):

        super(NavigationComponent, self).__init__(req, rset=rset, **kwargs)

        self.starting_from = 0

        self.total = rset.rowcount

    def get_page_size(self):

        try:

            return self._page_size

        except AttributeError:

            page_size = self.cw_extra_kwargs.get('page_size')

            if page_size is None:

                if 'page_size' in self._cw.form:

                    page_size = int(self._cw.form['page_size'])

                else:

                    page_size = self._cw.property_value(self.page_size_property)

            self._page_size = page_size

            return page_size

    def set_page_size(self, page_size):

        self._page_size = page_size

    page_size = property(get_page_size, set_page_size)

    def page_boundaries(self):

        try:

            stop = int(self._cw.form[self.stop_param]) + 1

            start = int(self._cw.form[self.start_param])

        except KeyError:

            start, stop = 0, self.page_size

        if start >= len(self.cw_rset):

            start, stop = 0, self.page_size

        self.starting_from = start

        return start, stop

    def clean_params(self, params):

        if self.start_param in params:

            del params[self.start_param]

        if self.stop_param in params:

            del params[self.stop_param]

    def page_url(self, path, params, start=None, stop=None):

        params = dict(params)

        if start is not None:

            params[self.start_param] = start

        if stop is not None:

            params[self.stop_param] = stop

        view = self.cw_extra_kwargs.get('view')

        if view is not None and hasattr(view, 'page_navigation_url'):

            url = view.page_navigation_url(self, path, params)

        elif path == 'json':

            url = self.ajax_page_url(**params)

        else:

            url = self._cw.build_url(path, **params)

        # XXX hack to avoid opening a new page containing the evaluation of the

        # js expression on ajax call

        if url.startswith('javascript:'):

            url += '; noop();'

        return url

    def ajax_page_url(self, **params):

        divid = params.setdefault('divid', 'pageContent')

        params['rql'] = self.cw_rset.printable_rql()

        return "javascript: $(%s).loadxhtml('json', %s, 'get', 'swap')" % (

            json_dumps('#'+divid), js.ajaxFuncArgs('view', params))

    def page_link(self, path, params, start, stop, content):

        url = xml_escape(self.page_url(path, params, start, stop))

        if start == self.starting_from:

            return self.selected_page_link_templ % (url, content, content)

        return self.page_link_templ % (url, content, content)

    def previous_link(self, path, params, content='<<', title=_('previous_results')):

        start = self.starting_from

        if not start :

            return self.no_previous_page_link

        start = max(0, start - self.page_size)

        stop = start + self.page_size - 1

        url = xml_escape(self.page_url(path, params, start, stop))

        return self.previous_page_link_templ % (url, title, content)

    def next_link(self, path, params, content='>>', title=_('next_results')):

        start = self.starting_from + self.page_size

        if start >= self.total:

            return self.no_next_page_link

        stop = start + self.page_size - 1

        url = xml_escape(self.page_url(path, params, start, stop))

        return self.next_page_link_templ % (url, title, content)

# new contextual components system #############################################

def override_ctx(cls, **kwargs):

    cwpdefs = cls.cw_property_defs.copy()

    cwpdefs['context']  = cwpdefs['context'].copy()

    cwpdefs['context'].update(kwargs)

    return cwpdefs

class EmptyComponent(Exception):

    """some selectable component has actually no content and should not be

    rendered

    """

class Layout(Component):

    __regid__ = 'layout'

    __abstract__ = True

    def init_rendering(self):

        """init view for rendering. Return true if we should go on, false

        if we should stop now.

        """

        view = self.cw_extra_kwargs['view']

        try:

            view.init_rendering()

        except Unauthorized, ex:

            self.warning("can't render %s: %s", view, ex)

            return False

        except EmptyComponent:

            return False

        return True

class CtxComponent(AppObject):

    """base class for contextual compontents. The following contexts are

    predefined:

    * boxes: 'left', 'incontext', 'right'

    * section: 'navcontenttop', 'navcontentbottom', 'navtop', 'navbottom'

    * other: 'ctxtoolbar'

    The 'incontext', 'navcontenttop', 'navcontentbottom' and 'ctxtoolbar'

    context are handled by the default primary view, others by the default main

    template.

    All subclasses may not support all those contexts (for instance if it can't

    be displayed as box, or as a toolbar icon). You may restrict allowed context

    as followed:

    .. sourcecode:: python

      class MyComponent(CtxComponent):

          cw_property_defs = override_ctx(CtxComponent,

                                          vocabulary=[list of contexts])

          context = 'my default context'

    You can configure default component's context by simply giving appropriate

    value to the `context` class attribute, as seen above.

    """

    __registry__ = 'ctxcomponents'

    __select__ = ~no_cnx()

    categories_in_order = ()

    cw_property_defs = {

        _('visible'): dict(type='Boolean', default=True,

                           help=_('display the box or not')),

        _('order'):   dict(type='Int', default=99,

                           help=_('display order of the box')),

        _('context'): dict(type='String', default='left',

                           vocabulary=(_('left'), _('incontext'), _('right'),

                                       _('navtop'), _('navbottom'),

                                       _('navcontenttop'), _('navcontentbottom'),

                                       _('ctxtoolbar')),

                           help=_('context where this component should be displayed')),

        }

    visible = True

    order = 0

    context = 'left'

    contextual = False

    title = None

    # XXX support kwargs for compat with old boxes which gets the view as

    # argument

    def render(self, w, **kwargs):

        if hasattr(self, 'call'):

            warn('[3.10] should not anymore implements call on %s, see new CtxComponent api'

                 % self.__class__, DeprecationWarning)

            self.w = w

            def wview(__vid, rset=None, __fallback_vid=None, **kwargs):

                self._cw.view(__vid, rset, __fallback_vid, w=self.w, **kwargs)

            self.wview = wview

            self.call(**kwargs)

            return

        getlayout = self._cw.vreg['components'].select

        try:

            # XXX ensure context is given when the component is reloaded through

            # ajax

            context = self.cw_extra_kwargs['context']

        except KeyError:

            context = self.cw_propval('context')

        layout = getlayout('layout', self._cw, rset=self.cw_rset,

                           row=self.cw_row, col=self.cw_col,

                           view=self, context=context)

        layout.render(w)

    def init_rendering(self):

        """init rendering callback: that's the good time to check your component

        has some content to display. If not, you can still raise

        :exc:`EmptyComponent` to inform it should be skipped.

        Also, :exc:`Unauthorized` will be catched, logged, then the component

        will be skipped.

        """

        self.items = []

    @property

    def domid(self):

        """return the HTML DOM identifier for this component"""

        return domid(self.__regid__)

    @property

    def cssclass(self):

        """return the CSS class name for this component"""

        return domid(self.__regid__)

    def render_title(self, w):

        """return the title for this component"""

        if self.title:

            w(self._cw._(self.title))

    def render_body(self, w):

        """return the body (content) for this component"""

        raise NotImplementedError()

    def render_items(self, w, items=None, klass=u'boxListing'):

        if items is None:

            items = self.items

        assert items

        w(u'<ul class="%s">' % klass)

        for item in items:

            if hasattr(item, 'render'):

                item.render(w) # XXX display <li> by itself

            else:

                w(u'<li>')

                w(item)

                w(u'</li>')

        w(u'</ul>')

    def append(self, item):

        self.items.append(item)

    def box_action(self, action): # XXX action_link

        return self.build_link(self._cw._(action.title), action.url())

    def build_link(self, title, url, **kwargs):

        if self._cw.selected(url):

            try:

                kwargs['klass'] += ' selected'

            except KeyError:

                kwargs['klass'] = 'selected'

        return tags.a(title, href=url, **kwargs)

class EntityCtxComponent(CtxComponent):

    """base class for boxes related to a single entity"""

    __select__ = CtxComponent.__select__ & non_final_entity() & one_line_rset()

    context = 'incontext'

    contextual = True

    def __init__(self, *args, **kwargs):

        super(EntityCtxComponent, self).__init__(*args, **kwargs)

        try:

            entity = kwargs['entity']

        except KeyError:

            entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        self.entity = entity

    @property

    def domid(self):

        return domid(self.__regid__) + unicode(self.entity.eid)

# high level abstract classes ##################################################

class RQLCtxComponent(CtxComponent):

    """abstract box for boxes displaying the content of a rql query not

    related to the current result set.

    """

    rql  = None

    def to_display_rql(self):

        assert self.rql is not None, self.__regid__

        return (self.rql,)

    def init_rendering(self):

        rset = self._cw.execute(*self.to_display_rql())

        if not rset:

            raise EmptyComponent()

        if len(rset[0]) == 2:

            self.items = []

            for i, (eid, label) in enumerate(rset):

                entity = rset.get_entity(i, 0)

                self.items.append(self.build_link(label, entity.absolute_url()))

        else:

            self.items = [self.build_link(e.dc_title(), e.absolute_url())

                          for e in rset.entities()]

    def render_body(self, w):

        self.render_items(w)

class EditRelationMixIn(ReloadableMixIn):

    def box_item(self, entity, etarget, rql, label):

        """builds HTML link to edit relation between `entity` and `etarget`"""

        args = {role(self)[0] : entity.eid, target(self)[0] : etarget.eid}

        url = self._cw.user_rql_callback((rql, args))

        # for each target, provide a link to edit the relation

        return u'[<a href="%s">%s</a>] %s' % (xml_escape(url), label,

                                              etarget.view('incontext'))

    def related_boxitems(self, entity):

        rql = 'DELETE S %s O WHERE S eid %%(s)s, O eid %%(o)s' % self.rtype

        return [self.box_item(entity, etarget, rql, u'-')

                for etarget in self.related_entities(entity)]